N-DL-Pyr-OH可作为乙型肝炎表面灭活剂，能灭活痘苗病毒、单纯疱疹病毒和流感病毒，但对脊髓灰质炎病毒无效。

(R)-5-Oxopyrrolidine-2-carboxylic acid is an endogenous metabolite.

Creatine is a key player in the phosphagen energy system, the primary source of ATP during short-term, high intensity activities.

Nepsilon-Acetyl-L-lysine is an R-chain N-acetylated α amino acid used together with other lysine analogues to differentiate and characterized various aminoacylases and regulator 2 (Sir2) enzymes/sirtuins.

5-Hydroxy-L-tryptophan is a hydroxylated metabolite of L-Tryptophan.

H-D-cis-Hyp-OH is an endogenous metabolite.

Selenomethionine is a naturally occurring amino acid containing selenium, is a common natural food source of selenium.

Triiodothyronine is a thyroid hormone generated by deiodination of the prohormone thyroxine (T4) and is a potent agonist of both thyroid hormone receptors TRα and TRβ (Kis = 2.3 nM for both).

H-Orn-OH H-Asp-OH salt是由鸟氨酸和天冬氨酸这两种天然非必需氨基酸组成，可用于降低血氨水平，缓解肝硬化引起的肝性脑病症状。

NMDA是 NMDA 受体的特异性激动剂，模拟正常作用于该受体的神经递质谷氨酸的作用。

Sarcosine is an NMDAR co-agonist at the glycine binding site. It is an intermediate and byproduct in glycine synthesis and degradation.

H-cis-Hyp-OH是脯氨酸的一种羟基化衍生物，通常用于合成胶原蛋白，促进胶原蛋白稳定和形成中起关键作用。

DL-Methionine Methylsulfonium Chloride (DL-MMSC) is a vitamin found in green vegetables with therapeutic effect on peptic ulcers, colitis, and gastritis. It is also used as a methionine analogue.

3,5-Diiodotyrosine Dihydrate is the substrate for the assay of halogenated tyrosine and thyroid hormone aminotransferase, also the intermediate in the biosynthesis and alternative pathways of thyroid hormones metabolism.